Thanks so much for the answer.
The story RHYME WITHOUT REASON sounds like it, but I would have sworn up and down that it was featured on the cover. THE RHYME SUBLIME has the same theme, so that might be it too.
Also the issue seems too early. I was six when RHYME WITHOUT REASON was printed. I wonder if it was reprinted before the listed reprints, which are, alas too late.
I will have to get my hands on both the issues.
Thanks again.